Codesign error with Flutter on iOS

Run

 flutter clean

in your command line.

For sure flutter clean helps, however, in my case, it was all about setting the Deployment Target to 9.0

Remember to also enable (uncomment or add) this line platform :ios, '9.0' at the top of your ios/Podfile file as long as you don't care about iOS versions below 9.0

So after a long time if finally figured out how to fix it.

The way I was able to fix is to delete the build directory in the root of your flutter project. The folder just gets rebuilt without the files causing the problem.

I assume it has something to do with forking the fonts/images I was adding to the project.

Edit (6/4/2019) You can also use flutter clean and it will also solve the issue. Stated by @Luke Stanyer below!